code: def test_check_increasing(self):
      data = np.abs(np.random.randn(100))
      data = data.cumsum()
      df = pdml.ModelFrame(np.arange(len(data)), target=data)
  
      result = df.isotonic.check_increasing()
      expected = isotonic.check_increasing(np.arange(len(data)), data)
      self.assertTrue(result)
      self.assertTrue(expected)
  
      data = np.abs(np.random.randn(100))
      data = data.cumsum()[-1::-1]  # reverse
      df = pdml.ModelFrame(np.arange(len(data)), target=data)
  
      result = df.isotonic.check_increasing()
      expected = isotonic.check_increasing(np.arange(len(data)), data)
      self.assertFalse(result)
      self.assertFalse(expected)
  
file_path: pandas-ml/pandas_ml/skaccessors/test/test_isotonic.py
imports: import numpy
  import sklearn.isotonic
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 3 for calling the TestIsotonic obj's underlying member method code with example usage: obj.test_check_increasing() without return types